Mac Pro (Early 2008): IRQARB Error reported in 64-bit Microsoft Vista

"IRQARB: ACPI BIOS does not contain an IRQ for the device in PCI slot 0, function 0. Please contact your system vendor for technical assistance."

This error message is reporting a hardware feature on the Mac Pro (Early 2008) that is not currently implemented in 64-bit Microsoft Vista. It is an informational message that you can ignore.

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